Synopsis
Kyung-chul is a dangerous psychopath who kills for pleasure. Soo-hyeon, a top-secret agent, decides to track down the murderer himself. He promises himself that he will do everything in his power to take vengeance against the killer, even if it means that he must become a monster himself.
Cast

Lee Byung-hun
Kim Soo-hyeon

Choi Min-sik
Kyung-chul

Jeon Kuk-hwan
Squad Chief Jang

Cheon Ho-jin
Section Chief Oh

Oh San-ha
Joo-yeon

Kim Yoon-seo
Se-yeon

Nam Bo-ra
Section Chief's Daughter

Lee Jun-hyuk
NIS Agent

Yoon Chae-yeong
Nurse Han Song-i

Choi Moo-seong
Tae-joo

Kim In-seo
Se-jung

Kim Kap-soo
Planning Team Deputy Head

Um Tae-goo
Detective

Choi Jin-ho
Planning Director
Mi-nam Jeong
Gangster in Taxi

Jo Deok-jae
Detective Kang
Jang Jeong-won
Kyung-chul's Son

Park Seo-yeon
Woman at Pension

Lee Seol-gu
Gangster in Taxi
Kim Yeong-chan
Young Pharmacist
Goo Yong-wan
Corporal
Kim Dae-hye
Hospital Worker

Kim Jae-geon
Old Doctor

Park Ji-yeon
Teacher
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